| Measurement of the fluidized velocity in gas-solid fluidized beds based on AE signal analysis by wavelet packet transform |
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| 作者单位： | WANG JingDai（Department of Chemical and Biochemical Engineering, State Key Laboratory of Chemical Engineering, Polymer Reaction Engineering Division, Zhejiang University, Hangzhou 310027, China） ;
YANG YongRong（Department of Chemical and Biochemical Engineering, State Key Laboratory of Chemical Engineering, Polymer Reaction Engineering Division, Zhejiang University, Hangzhou 310027, China） ;
GE PengFei（Department of Chemical and Biochemical Engineering, State Key Laboratory of Chemical Engineering, Polymer Reaction Engineering Division, Zhejiang University, Hangzhou 310027, China） ;
SHU WeiJie（Department of Chemical and Biochemical Engineering, State Key Laboratory of Chemical Engineering, Polymer Reaction Engineering Division, Zhejiang University, Hangzhou 310027, China） ;
HOU LinXi（College of Chemical Engineering and Materials Science, Ningbo University, Ningbo 315211, China） ; |
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| 摘 要： | An energy distribution theory was presented based on regular evolvement of energy fraction of acous-tic signals with fluidization velocity. Wavelet packet analysis was used in processing the acoustic sig-nals originated from particle impact on the wall of a fluidized bed. A new criterion of judging incipient fluidization(Umf) velocity and minimum turbulent velocity(Umt) was proposed according to the energy distribution theory. Experiments were performed with five groups of high density polyethylene(PE) particles and one bimodal PE to acquire incipient fluidization velocity and minimum turbulent velocity by using the criterion. The feasibility of this method in obtaining characteristic fluidization parameters was further verified by comparing it to results from the pressure drop method and the empirical value from industry.
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| 收稿时间： | 4 July 2005 |
| 修稿时间： | 19 November 2006 |
Measurement of the fluidized velocity in gas-solid fluidized beds based on AE signal analysis by wavelet packet transform |
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| Authors: | Wang JingDai Yang YongRong Ge PengFei Shu WeiJie Hou LinXi |
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| Institution: | 1. Department of Chemical and Biochemical Engineering, State Key Laboratory of Chemical Engineering, Polymer Reaction Engineering Division, Zhejiang University, Hangzhou 310027, China
2. College of Chemical Engineering and Materials Science, Ningbo University, Ningbo 315211, China |
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| Abstract: | An energy distribution theory was presented based on regular evolvement of energy fraction of acous-tic signals with fluidization velocity. Wavelet packet analysis was used in processing the acoustic sig-nals originated from particle impact on the wall of a fluidized bed. A new criterion of judging incipient fluidization(Umf) velocity and minimum turbulent velocity(Umt) was proposed according to the energy distribution theory. Experiments were performed with five groups of high density polyethylene(PE) particles and one bimodal PE to acquire incipient fluidization velocity and minimum turbulent velocity by using the criterion. The feasibility of this method in obtaining characteristic fluidization parameters was further verified by comparing it to results from the pressure drop method and the empirical value from industry. |
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| Keywords: | fluidized bed minimum fluidization velocity minimum turbulent velocity acoustic emission wavelet packet transform |
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